Minimal vmx-file

A very short vmx-file only needs 3 lines - I call them the
identity-lines.
This minimal vmx is enough to start a VM.
It is the equivalent of starting a legacy-real-metal box
with nothing more than the main-board with 32MB RAM and one
CPU plugged
in.

If you forget one of this critical parameters or
misconfigure it the
VM will not start and give an error-message.

guestOS = "dos397"

causes an error-message

Guest operating system ´dos397' is not
supported

The list shows this 3 minimal required lines for the different versions